CHAP. XVII.] THE BRAIN OP QUADRtTMANA. 295 



nn adult. It was both young and small ; its height being 

 2 ft. 4 in., its weight 16J Ibs., whilst the weight of its 

 brain was 14 ozs. The proportion of its brain-weight to 

 its body- weight was therefore 1:19. 



The brain of an Orang also has been described with 

 great care and minuteness by Prof. Rolleston.* It was 

 taken from a young male, weighing 16 J Ibs., whose height 

 was 2 ft. 7 in. As the weight of the brain was 12 oz., 

 its weight compared with that of the body was 1 : 22-3. 



Our knowledge of the brain of the Gorilla is still very im- 

 perfect ; as of the three specimens which have, as yet. been 

 examined, one was in a very poor condition, t and the two 

 others were taken from very dissimilar animals the one, 

 examined by Broca, being an adult male, I and the other a 

 young specimen, only six months old. Broca suspects, 

 moreover, that there may be two species of Gorilla, instead 

 of one as hitherto supposed ; and, while admitting that 

 the brain of the Orang presents a slightly higher type than 

 that of the other two, he considers the brain of the Gorilla 

 to be on the whole simpler than that of the Chimpanzee. 



The Cerebral Hemispheres in the Chimpanzee were 

 much smaller in proportion to the size of the Cerebellum 

 than they are in the human Brain. They, however, 

 slightly overlapped the Cerebellum, and this organ was 

 flatter and wider than it is in Man. 



Looked at from above (fig. 115) the Chimpanzee's 

 brain has a short, wide, ovoid form, though in the lower 

 races of Man it has a long, ovoid outline. Seen in profile, 



* " Nat. History Beview," 1861, p. 201. 



t That of an adult female, examined by Gratiolet, in 1860. 



J " Etude sur le Cerveau du Gorille," Revue d'Anthropologie, 

 1878. 



This was examined by Drs. Bolau and Pansch, and their 

 account was made the subject of some interesting comments by 

 Prof. G. D. Thane (" Nature," December 14, 1876). 



